2666694591 has 12 divisors (see below), whose sum is σ = 4202064360. Its totient is φ = 1616178480.

The previous prime is 2666694587. The next prime is 2666694661. The reversal of 2666694591 is 1954966662.

It is not a de Polignac number, because 2666694591 - 2² = 2666694587 is a prime.

It is a super-2 number, since 2×2666694591² = 14222520083337314562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666694091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13468056 + ... + 13468253.

It is an arithmetic number, because the mean of its divisors is an integer number (350172030).

Almost surely, 2^2666694591 is an apocalyptic number.

2666694591 is a deficient number, since it is larger than the sum of its proper divisors (1535369769).

2666694591 is a wasteful number, since it uses less digits than its factorization.

2666694591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26936326 (or 26936323 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 2666694591 is about 51640.0483249193. The cubic root of 2666694591 is about 1386.7273890972.

The spelling of 2666694591 in words is "two billion, six hundred sixty-six million, six hundred ninety-four thousand, five hundred ninety-one".